Eastman, N., & Hellman, L. M. (1961). Williams Obstetrics (12.ed.). Appleton-Century-Croffts.
Lua i Stíl Chicago (17ú heag.)Eastman, Nicholson, agus Louis M. Hellman. Williams Obstetrics. 12.ed. New York: Appleton-Century-Croffts, 1961.
Lua MLA (9ú heag.)Eastman, Nicholson, agus Louis M. Hellman. Williams Obstetrics. 12.ed. Appleton-Century-Croffts, 1961.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.